Bug 5878 – Forward reference in returning superclass from template using is() expression (Breaks std.traits.BaseTypeTuple)

Test case: ------------------------ template J(A) { static if (is(A P == super)) alias P J; } alias J!(A) Z; class X {} class A : X {} ------------------------ y.d(6): Error: forward reference to '(in X)' ------------------------ The template J is basically std.traits.BaseTypeTuple. Because of this bug, any use of BaseTypeTuple!A before A is defined (not just X) will result in a forward-reference bug.

D2 pull: https://github.com/D-Programming-Language/dmd/pull/1859

Commits pushed to master at https://github.com/D-Programming-Language/dmd https://github.com/D-Programming-Language/dmd/commit/ae640c4414237fcb3edc14a664aa484a1a284257 fix Issue 5878 - Forward reference in returning superclass from template using is() expression https://github.com/D-Programming-Language/dmd/commit/94e608ad923eb33c0c7f8f05cea57fc50e73d169 Merge pull request #1859 from 9rnsr/fix5878 Issue 5878 - Forward reference in returning superclass from template using is() expression